The Q biotype of Bemisia tabaci (a.k.a. B. argentifolii) was first detected in the New World in 2004. It was collected on poinsettia plants obtained from a retail vendor in Tucson, Arizona. This new whitefly biotype was shown to possess high levels of resistance to a broad range of insecticides, including insect growth regulators and neonicotinoids. We will summarize research conducted in Arizona since the initial finding of the Q biotype, emphasizing the distribution in field crops and ornamentals, and resistance status.